Introduce Github Actions CI workflow

Introduce Github Actions CI workflow to compile test Pull Request and
push.

Add simple build test on Windows and advanced test with various compile
option for Ubuntu.

Signed-off-by: Christian Marangi <[email protected]>

.github/workflows/build.yml

@@ -0,0 +1,94 @@
+name: Build
+on:
+  push:
+  pull_request:
+
+jobs:
+  build-windows:
+    name: Build Windows
+    runs-on: windows-latest
+
+    steps:
+      - name: Add msbuild to PATH
+        uses: microsoft/setup-msbuild@v2
+
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          path: nmap
+
+      - name: Checkout mswin32-aux
+        run: svn checkout https://svn.nmap.org/nmap-mswin32-aux
+
+      - name: Prepare pcre2
+        working-directory: nmap\mswin32
+        run: |
+          mkdir build-pcre2
+          cd build-pcre2
+          cmake.exe -A Win32 ..\..\libpcre\
+
+      - name: Build
+        working-directory: nmap\mswin32
+        run: |
+          msbuild nmap.sln /p:Configuration="Release"
+
+  build-macos:
+    name: Build Macos
+    runs-on: macos-latest
+
+    steps:
+      - name: Install Deps
+        run: |
+          brew install openssl
+
+          python3 -m pip install build
+
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Configure
+        run: ./configure
+
+      - name: Build
+        run: make
+
+  build-ubuntu:
+    name: Build Ubuntu
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        config:
+          - "--without-openssl"
+          - "--without-libssh2"
+          - "--without-liblua"
+          - "--without-zenmap"
+          - "--without-ndiff"
+          - "--with-nping"
+          - "--with-ncat"
+
+    steps:
+      - name: Install Deps
+        run: |
+          sudo apt install python3-build
+
+          # python3-build installed from apt is currently broken
+          # Workaround is to just update it
+          # 
+          # Can be dropped eventually once it's correctly handled.
+          python3 -m pip install --upgrade build
+
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Configure
+        run: ./configure ${{ matrix.config }}
+
+      - name: Build
+        run: make
+
+      - name: Check
+        run: make check
+
+      - name: Install
+        run: sudo make install